Intel's technological advantage is clear here, with efficiency factors for LGA1156 chips starting at 8.3, thanks to far higher overall CPC benchmark scores. Quite clearly the ball is in a whole different court compared to AMD. Despite the Core i5-750 and Core i7-870 both being '95W' TDP parts, the i5-750 system requires 35W less under load to complete the tasks. The Core i3-530 is rated at 73W but requires 42W less - but bear in mind its TDP takes into account the GMA HD graphics portion which we weren't using.
The Core i3-530 has the winning combination of not only being faster than AMD's cheap quad-core Athlon II X4 635s, but also only using 75 per cent of the power, so it generates a leading efficiency factor of over 10. The factor drops quite consistently as we look through the Intel range, although the i5-750 comes close at 9.42, and then the i7-870 again drops a point to 8.30.
It just goes to show how good Intel's 32nm parts are - despite the fact the Core i3-530 can never power down the 45nm GMA HD within the CPU package, because it also includes the PCI-Express and memory controller.